JPH0751047Y2 - Adhesive heating element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a heating element having an adhesive fixing function.

[Prior Art and Problems to be Solved by the Present Invention] A heat generating agent composed of metal powder, water, a water retention agent, an oxidation accelerator, etc. does not require ignition and simply generates heat by contacting with air (oxygen). .

In recent years, a heating element in which the heating agent is contained in a bag having a ventilation hole has become widespread as a disposable body warmer. This known heating element contains a heat-generating agent in a bag (hereinafter referred to as an inner bag) made of a non-breathable packaging material or a breathable packaging material having an appropriate ventilation hole on the surface, and is made of a non-breathable film. It is stored in another bag (hereinafter referred to as the outer bag) and is taken out from this outer bag for use. It is also well known that such a type of heating element generally has high industrial productivity and is commercially available as the mainstream of disposable body warmers due to its convenience in use.

However, since these normally commercially available heating elements do not have a fixing function, the heating element may be displaced from the mounting site if it is mounted as it is, or the heating element may fall off from the body during use.

As a method for fixing the heating element, it is sufficient to use an auxiliary tool such as a body warmer holder or a body warmer belt, but recently, it is desired that the heating element can be fixed by a simpler operation without any trouble. .

As a known heating element for such a demand, (1) a heating agent is contained in a flat heating bag having oxygen permeation on one side,
A heat-generating bag having a non-transferable pressure-sensitive adhesive layer provided in a solid or appropriate pattern on almost the entire other surface of the bag.
-34735) or (2) A sticking piece made of an adhesive substance whose main material is rubber or synthetic resin to be stuck to one outer surface of the inner bag is separated from the inner bag and placed in the outer bag. There is a chemical exothermic heat retaining device (Jitsuko Sho 60-7051) and so on.

However, these heating elements have various drawbacks as follows.

Regarding the heating element of (1), it is uneconomical because the adhesive layer is provided over almost the entire other surface of the heating bag in order to maintain the fixing function of the heating element, and it is also uneconomical when peeling off the release sheet. There is a drawback that it is difficult to peel off. Further, since the entire other surface of the heating element is adhered to the adherend, the skin surface is apt to become damp and uncomfortable.

Regarding the heating element of (2), there is a trouble that the user has to stick the sticking piece to the heating element when using the heating element, and the sticking part of the sticking piece to the heating element and its area. In some cases, the heating element may be peeled from the mounting portion due to an unexpected peeling force applied from the end portion of the heating element during the mounting operation.

SUMMARY OF THE INVENTION The present invention provides a heating element that has improved the conventional drawbacks, improved convenience in use, improved industrial productivity, and provided a seal portion with a wrinkle-free fixing function.

[Means for Solving the Problems] The present invention provides a heating agent storage bag having a composite packaging material including a base material sheet coated with an adhesive and a release sheet on one side, and a breathable packaging material on the other side, and is provided with an air bag. In an adhesive heating element containing a heating agent that generates heat in the presence of a base material, a coating section formed by coating the adhesive on the left and right sides and a non-coating section formed by both coating sections are used as a base material. The sheet has a release sheet, which covers both the application part and the non-application part, a void is formed in the non-application part, and at least one or more holes are provided in the release sheet in the part which covers the non-application part. The present invention relates to an adhesive heating element characterized in that

A specific example of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of the adhesive heating element of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.

The application portion of the pressure sensitive adhesive 2 of the present invention is provided separately on the left and right sides of the base sheet 1. As a result, the application area of the adhesive 2 is reduced, which is economical, and the end portion of the adhesive heating element can be brought into close contact with the adherend. Generation can be suppressed as much as possible.
It is preferable to provide the divided coated portions of the adhesive 2 in parallel with each other.

The ratio of the pressure-sensitive adhesive 2 to be divided into the left and right sides is not particularly limited, but it is preferable to average it, and the coating area ratio of each is about 25% of one side of the exothermic agent storage bag, and the sum is 50%.
It is preferable to provide it so that the number is less than 1. By doing so, the fixing function as an adhesive heating element is sufficiently exerted. In addition, the stuffiness of the skin due to the moisture and heat generated from the heating element is also alleviated.

At least one hole 4 is provided in the non-application portion 5 of the release sheet 3. This hole 4 improves the mechanical sealing property of the heat-generating agent storage bag, and can prevent wrinkles from occurring in the heat-sealing portion 11. That is, the exothermic agent storage bag is usually formed by heat-sealing the composite packaging material 6 and the breathable packaging material 9 with a heat roller, and the composite packaging material 6 is continuously supplied to the heat roller while applying tension with a tension roller. However, at this time, in the composite packaging material 6 between the heat roller and the tension roller, the internal space of the non-application portion 5 sandwiched between the base material sheet 1 and the release sheet 3 is affected by heat and expands, so that heat is applied. Although wrinkles that tend to impair the commercial value tend to be generated in the seal portion 11, such expansion can be prevented and the wrinkles can be eliminated by providing the holes 4. In particular, when the composite packaging material 6 provided with the coating portion of the pressure-sensitive adhesive 2 in the supply direction to the heat roller is used, the internal space becomes a closed state, so that it expands more and wrinkles become remarkable. The effect of preventing wrinkles from being generated by the holes 4 becomes remarkable.

Further, the hole 4 is preferably a continuous hole having a broken line shape or a perforation line or a notched line hole provided in the central portion of the non-application portion 5 of the release sheet in parallel with the application portion. It is possible to solve the problem of the mechanical sealing property and to make the release sheet 3 in the non-adhesive region 5 easier to grip and peel off at the time of mounting.

The breathable packaging material 9 is a packaging material that controls the supply of air to the exothermic agent 10 or the adjustment of the supply rate thereof, and includes (a) non-woven fabric,
(B) Porous sheet (brand name NF sheet (manufactured by Tokuyama Soda),
Product name Serpore (manufactured by Sekisui Chemical Co., Ltd.), product name Breathlon (manufactured by Nitto Denko), etc. or a laminated sheet of porous sheets and non-woven fabric, (c) Machined by a blade type etc. on a laminated sheet in which a non-woven fabric is laminated with a plastic film Perforated, or (d) a non-woven fabric or a porous sheet laminated with a plastic film in which ventilation holes are provided in advance.

Particularly preferred specific examples include the porous sheet 7 or a laminated sheet of the porous sheet 7 and the nonwoven fabric 8. If such a breathable wrapping material is used and its air flow rate is adjusted as in Japanese Utility Model Publication No. Sho 63-195829, it will fit as a sticky heating element along the curved part of the body and is highly flexible. In addition, there is no powder leakage of the heating agent, and it is possible to prevent the heating agent 10 from moving or being biased without requiring structural or physical means such as partitioning as a heating agent storage section or using a holding material. And a flexible adhesive heating element can be formed.

A film having a good heat-sealing property is usually used as the base material sheet 1 constituting the composite packaging material 6, and a paper, a film or the like is applied to the release sheet 3. A conventional adhesive is used as the adhesive 2, and is selected from, for example, rubber-based, acrylic-based or vinyl acetate-based adhesives. The base material sheet 1 and the pressure-sensitive adhesive 2 may be used by applying a functional material such as a far-infrared ray-generating substance on the surface or inside thereof.

The exothermic agent 10 may be a composition that generates heat in the presence of air, and examples thereof include (a) metal powder such as iron powder, (b) water, and (c).
A composition containing an oxidation aid such as a metal halide salt or a sulfate and a water retention agent such as (d) wood flour, leucite, activated carbon or a water absorbing polymer as a main component is applied.

[Advantages of the Invention] The heating element according to the present invention is industrially advantageous compared to the conventional one, and its convenience is increased when it is used. Moreover, wrinkles are prevented due to the divided adhesive coating part and the release sheet, and the appearance is improved. It does not spoil the aesthetics.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of the adhesive heating element of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. The symbols in the figure are as follows: 1 ... Base sheet 2 ... Adhesive 3 ... Release sheet 4 ... Pore 5 ... Non-adhesive area 6 ... Composite packaging 7 ... Porous sheet 8 ... Nonwoven fabric 9: Breathable packaging material 10: Heating agent 11: Heat seal part

Claims (2)

[Scope of utility model registration request] 1. A heating agent storage bag having a composite packaging material comprising a base material sheet coated with an adhesive and a release sheet on one side and a breathable packaging material on the other side, and a heating agent that generates heat in the presence of air. In the housed adhesive heating element, the base material sheet has an application part formed by applying the adhesive on both the left and right sides and a non-application part formed by both application parts, and the release sheet is Covers both application and non-application areas, forming voids in the non-application area,
At least 1 for the release sheet covering the non-coated area
An adhesive heating element, characterized in that it is provided with holes equal to or larger than a number. 2. At least one or more holes provided in the release sheet is a continuous line having a broken line or a perforation line or a notched line hole provided in the central portion of the non-application portion in parallel with the application portion. Item 1. The adhesive heating element according to item 1.